SunSmile*2013 via eBay offers this 2.4" LCD Electronic Peephole Monitor
with free shipping
. That's $2 under our mention from last week and the lowest total price we could find for a similar item now by $7, outside of the mention below. It includes a 3-megapixel camera and a monitor which features a 2.4" TFT LCD screen with a native resolution of 240x320, 100° viewing angle, and 15-second automatic shutdown.
Of note, expect this item to take three to eight weeks to arrive.
A close price: FashionWomenSale via eBay
has a similar model for $23.20 plus $1.50 for shipping.